Lathe



(No Model.) i 2 Sheets-Sheet 1.

P. H; CLEMENT. Y

- LATHB.

PatentedJune 10, 1890.

UNITED STATES' PATENT trice.

yFRANK H. CLEMENT, OF ROCHESTER, NEW YORK.

LATH E.

SPECIFICATION forming part of Letters Patent No. 429,603, dated June 10,1890.

Application filed September 13, 1

To all whom i5-may concern:

Be it known that I, FRANK H. CLEMENT, a citizen of the United States,residing in the city of Rochester, State of New York, have inventedcertain new aud useful Improvements in Automatic Lathes, of which thefollowing is a specification.

My invention relates to lathes for turning regular forms automatically;and it consists, mainly, in certain improvements in the travelingcarriage and the parts connected therewith, whereby greater efficiencyin operation and durability are obtained, as hereinafter fullydescribed.

In the accompanying drawings, Figure l, Sheet l, is a front elevation ofthe carriage, feed-works, and tool-stocks, with a portion of the bed andfeed-screw.. Fig. 2 is a reversed elevation of the apron, showing thefeed-nut disengaged from the screw. Fig. 3 is a section of thescrew-shaft showing the nuts in end elevation. Fig. 4, Sheet 2, is atransverse section at the line oc, Fig. 1, showing the toolstocks andother parts in elevation. Figs. 5 and 6 are reversed elevations of theform-bar and feed-nut lock, respectively.

A, Figs. l and 4, is a carriage fitted to slide on suitable ways on thebed B, having apron O bolted to it for the purpose of attaching theautomatic feed mechanism.

F is the feed-screw, having bearings on the bed B and driven in anyconvenient manner.

L L are chisel-stocks pivoted to the carriage on the pin c and arrangedto follow a form CZ, fastened to the lathe-bed.

The stick to be turned is revolved at a high speed upon centers c c',carried on suitable head and tail stocks in the usual manner.

The above parts are old and well known, and it is to details hereinafterdescribed that my invention relates.

Near the center of the face of the apron there is a gudgeon D, having abearing on the front plate D' of the apron and carrying at its inner endthe oscillating lever E. To its outer extremity is keyed the weightedlever G. Near each extremity of the lever E there is a bearing toreceive the gudgeons b, Figs. 3 and 4, which project from the halves f fof the' shear-nut. rlhese halves are fitted to the feed-screw bythreading or by pouring soft metal in recesses provided in them, asshown 889. Serial No. 328.834. (No model.)

in dotted lines,Fig. 3. Vings h project from the back of the halves ff',and are fitted to move easily between bosses or stops t, Fig. 2, on theapron, the contiguous faces of which are slightly roun ded, asindicated. The ofiice of these guiding-stops is to retain theposition ofthe halfenuts parallel, or nearly so, to the screw while being thrown inor out. The centers of the gudgeons b are preferably located on or nearthe center line of the screw when the half-nuts are in mesh, (as theyare shown in Figs. 1 and 4,) and at the center of the half-nutslongitudinally, and the wings h vertically over and under these points;but such position is not absolutely essential.

From a stud or pin e on the carriage depends a vertical hanger H, havinga projecting hook lo, and upon the lever G there is a correspondinglatch O, adjustably secured thereto by means of a central stud Z andclamping-screw m, moving in a slot in the latch, as shown in Fig. 6.counterweighted on one side at H, so as to force it into engagement withthe latch O; but to insure such engagement instantaneously there isaspring J, attached to *the lever G and to a lug on the lower end of thehanger H in any convenient manner, connecting the two at an angle ofabout forty-five degrees, so that the spring acts about equally on both.It will be seen from the foregoing that when vthe lever G is held up inthe position Ashown `in Fig. 1 by the latch O and hook K the halves ofthe shear-n ut will be in mesh with the feedscrew; but when the hanger His pushed, to the right the springJ and counter-weight G force the arm Gdownward and open the halves f' f of the shear-nut, as indicated inFigs. 2

and 3, thus stopping the carriage. The hanger H is tripped when thecarriage arrives at the end of its movement by a suitable stop n, Fig.l, secured to the' lathe-bed.

It will be seen that since the opening and closing of the nut are doneby. means of the joints D b the friction is much less than by the oldmethod of sliding the half-nuts in a vertical way, and they are moresure to be opened by the weight G when the hanger H is tripped. Thereis,furthermore, very little Wear on these joints compared to the slide,and the halves 'cannot cramp and stick when being opened IOO O the wearof the latter and hook K, as well as the dia-metrica] wear on the screwand nut, can be compensatcd-an important matter on all such lathes.

I have shown in dotted lines in Fig. 2 an equivalent device to the wingsh and guidestops fz', consisting of links Ii', pivoted to the hait-nutsand to the apron C. These links retain the position of the half-nutssimilarly to the stops t'.

The chisel-stocks L as usually made have a foot'piece or rider pfollowing the form. This is commonly adjustable vertically on thechisel-stock by clamp-screws in slots for dit'- ferent diameters of workto be turned. This is a troublesome construction, consuming a great dealof time, and, moreover, is not accurate. I therefore make thechisel-stocks in two parts L and L', Fig. Ll, pivoted together at q atabout the center of theirlength. One extremity of the arm L carries therider p, and the other is connected to the stock L by a screw r. Thisscrew is necked into a slot in the stud Z, secured to the stock so as toswivel slightly, andis threaded into a similar swivelod stud Z on arm L.Turning the screw thus raises and lowers the pivoting-point q, andconsequently increases or diminishes the distance between the chisel Ctand the rider p, thereby changing the diameter of the work. Thisadjustment can be made at any time while the lathe is running and thechisel is in the cut or otherwise, as desired, and can be made as exactas required. The range of the screw r is such as to admit the largestand smallest work for which the lathe has capacity.

Usually7 in lathes of this character the forms for guiding thetool-stocks are either screwed upon the top ot' the lathe-bed or clampedup against the faceot it by dogs' s, as indicated in Fig. et. It oftenhappens, however, that it is necessary or desirable to use two forms oi'different shapes guiding separate chisels, in which case they must befar enough apart so that each rider will rise and fall clear of theother form. I therefore provide a separate bar N, Figs. l and 5, to oneside of which one forni is clamped by dogss and suitable screws. Uponthe other side there are lugs ,a trifle thicker than the torni, placed afew inches apart and preferably beveled to an edge, or nearly so, at theiop, upon which edges the form d rests. The bar N is bolted rigidly tothe bed 13 of the lathe, and the form is clamped up tight by means ofscrews o, threaded into the lathe-bed. By this means it is bnta mo mentswork to remove either form, and a iiat thin bar can be used for formseasily worked on its edge to the required shape. By means of the lugs iflarge openings are left under the form for t-he passage of chips anddirt.

In Figs. l and It I have shown a rodw, connecting'the chisel-stocks withthe d rop-lever i G by means of suitable lugs formed on them. The objectof this is that when the carriage is stopped by the dropping of thelever G the riders are lifted from the forms and the latter preservedfrom wear when the carriage is on the returirstroke.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s-

l. In an automatic lathe, the combination of a carriage and itsfeed-screw, an oscillating lever E, with the haltnuts f f pivotedthereon on opposite sides of its central bearing, and suitable guides t't', constructed and operating substantially as described.

2. The combination ot a lathecarriage and its feed-screw, oscillati nglever E, with half nuts ff pivoted thereon at opposite sides ot itsbearing, suitable guides t' t', and the weighted drop-lever G foroperating said half-nuts, substantially as set forth.

3. In an automatic lathe, the combination of the pivoted tool-stock Land adjunct arm L', pivoted thereon, the guide or pattern upon which theopposite end of the adjunct arm rests, and the adj Listing-screw r,engaging one end of both stock and arm and shouldered in its bearings,whereby the parts connected may be adjusted and held at any pointwithout bin ding-screws or other clamps, substantially as set fort-h.

1. In an automatic lathe, the combination, with theindependently-pivoted chisel-stocks, of two parallel forms (l d', theintermediate torm-bar N, adj ustably secured to the frame, and the clampfor holding the outer form, substantially as described.

5. The combination et the half-nuts ff', oscillating lever E, weighteddrop-lever (nl, and the latch O, swinging upon a pivot Z and adj ustableby means oi' a slot and clam p-screw m, substantially as set forth.

FRANK ll. CLEMENT. iVitnesses:

J. E. MCKELVEY, G. SOUTHARD.

IOO

